It just might be the world’s priciest musical instrument.

A very rare Stradivarius viola is expected to sell for more than $45 million in a private sale by Sotheby’s.

They say that would be a record for a musical instrument sold privately – or at auction.

The rare instrument is one of two violas created by Antonio Stradivari that are still in private hands.

Only 10 of the master’s violas are known to have survived.

This one is “the Macdonald” and is named after the 3rd Baron Macdonald, Godfrey Bosville – who bought it in the 1820s.

Amadeus Quartet member – the late Peter Schidlof acquired the viola in 1964. His estate is now selling it.

Potential buyers can submit sealed bids until sometime in June.